Inventories



($ in millions)	June 30, 2018		December 31, 2017
Finished products		$1,218		$1,083
Work in process	204		177
Raw materials	500		437
Supplies	34		33
Total Inventories		$1,956		$1,730

Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 33% and 34% of total inventories at June 30, 2018 and December 31, 2017, respectively. If the first-in, first-out method of inventory valuation had been used, inventories would have been $113 million and $103 million higher as of June 30, 2018 and December 31, 2017, respectively.